The Effect of MWCNT Addition on Mechanical Properties of Epoxy Based Adhesives

In this study, multi-walled carbon nanotubes (MWCNT) in different weight ratios effect on the mechanical properties of modified epoxy based adhesive under an axial load was investigated. 0.25, 0.50, 0.75 and 1 % by weight ratio the MWCNT added epoxy adhesives were prepared. Tensile test specimens of MWCNT added epoxy adhesives were produced in accordance with ASTM D638-10 and the tensile tests under axial load were performed. The tensile strength, elastic modulus, and toughness of the modified epoxy adhesives were calculated. As a result of these tests, tensile strengths and deformation of the samples were compared with reference (neat epoxy) samples and different proportions of MWCNT additive epoxy based adhesives. While the maximum strain of the epoxy adhesive is obtained as 0.061(mm/mm), it was obtained to 0.081(mm/mm) for 0.25% MWCNT added modified epoxy-based adhesive. In addition, fractured surfaces of the adhesives were analyzed by scanning electron microscopy (SEM) and damage mechanisms were investigated. By increasing the amount of MWCNT by weight, the agglomeration regions have been seen and because of these agglomerations, it has been observed to decrease in the mechanical properties such as tensile strength, etc.